Power-transmission device.



No. 865,138. PATENPED SEPT. s, 1907 E. P. WARNER. l

POWER TRANSMISSION DEVISE.

APPLIOATION FILED SEPT. 4. 190s.

UNITED sTATEs PATENT oEEioE.

EDWARD PERCY WARNER, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

WARNER CLUTCII COMPANY, A CORPORATION Ol" ILLINOIS.l

POWER-TRANSMISSION DEVICE.

, Specification of Letters Patent.

Patented sept. 3,1907.

Application tiled September 4, 1906. Serial No. 333,244.

To all whom t may concern:

Be it known that I, EDWARD PERCY WARNER, a citizen of the United States, and a resident ol Chicago, in the county of Cookand State of Illinois, have invented a certain new and useful Improvement in Po wer-Trans mission Devices, of which the following is a full, clear, and exact specilication. I

My inventionrelates to means for transmitting the power and motion of the drivcshatt of an engine or other motor to the driven-shaft of any suitable mechanism, such, for example, as the driven-shalt of an automobile. i

The object of this invention is to provide an easily operated device for performing this function in an eiiective manner so that the initial engagement between the driving and' driven elements will not cause a sudden vjerk to the latter. In order to overcome the tendency of the machine to move forward suddenly I provide suitable connecting meansfor these respective parts by' the use of which the power and motion oi the revolving motor shaftis taken up with the increasing of the fricltion betweenthem until the entire strength of theformer is positively transmitted to the latter and caused to move coincident therewith. This I accomplish by the vmoans hereinafter fully described in the specification and as more particularly pointed out in the claims.

In thedrawingsQ-Figure l is a front elevation oi my improvement having the surrounding shell and lrictions band in section for the purpose oi clearer illustration. 'Fig 2 isa transverse sectional viewvof the same. Figs. 3 ande are enlarged detail views showing the -inanner of engaging the power-shaft and the driven-shaft. 4

Referring to the drawings, A represents the powershaft of a motor lor engine that is preferably extended beyond itsy bearings and on the outer end it is provided '-'with an enlarged drumor head B. This drum B is adapted to revolve freely within a hollow cylindrical shell'or casing C when the transmission device is not connected therewith,l and said shell is formed, preterably, of two oppositelydisposed corrcspondinglyshaped sections bolted together. This shell is provided with an elongated bearing-bosse on one oi its ends into which is keyed or otherwise secured a drivewshalt D,

that may correspond in its operation and function to the vdriving-shaft of an automobile or like vehicle, or the driving-shaft of any kind of a machine.

Securely mounted in any suitable manner to a boss b on the interior of the shell C is a belt E, preferably oi sheet metal, that is so shaped that it remains substantially concentric with and surrounds the drum B alp though normally` out of contact therewith. A slight l tween the parts, and, as this friction is increased, the

chine, it is necessary that only a relatively small 60 amount of friction be produced at iirst, but the same may be gradually increased until the belt is itightly clamped against the drum. l'The free end of the belt' E- is preferably bent outward toform a slight hook or lip e, that is engaged by a togglc-jointconsisting of links 65 I, Ff, extending transversely across the widthiof the drum. Link Ff has one end secured to a suitable boss f projecting into the interior of the shell and its opposite end is connected to link F, while the' latter link F has the edge ot' its free end rounded to engage the 70 hooked end e of the belt. A pinion G is mounted in a screw-threadedbearing g in the shell, and has the upper end of its spindlescrew-threaded and tapped into said bearing, while the lower' portion of the spindle engages the links oi the toggle at'their joint, as shown.

In order to operate this mechanism, a rack-bar H is? provided that reciprocates in bearings in the shell and has its teeth engaging with those ofthe pinion G. The inward movement of rack-bar H will revolve pinion G in its screw-threadedy bearing and thereby cause it to be moved outward a slightdistance. This movement of the pinion and its spindle presses down on the cen-v tral joint ofthe toggle, forcing the opposite ends apart thereby taking up the slack iu Vthe belt' and bringing the same into frietional contact with the Tdi-um. By pushing the raclebar H farther into the shell the spindle of pinionG forces theV ends of ythe toggle apart to a greater extent and the friction between the drum and belt is proportionately increased until the latter, is tight against the drum in which position all ofthe parts will revolve at the same time with the motor and shalt. Thus it will be observed that by the employment of the above-described mechanism, the friction produced between the drum and beltis regulated to a nicety, and can be increased or reduced with such accuracy 95 that the possibility ol a too sudden start ol' the drivenshaft is positively avoided.A

ln order to provide means for. operating the rack-bar H a suitable disk I is loosely keyed to the outside ot bearing-boss c, and, although revoluble therewith, it .is adapted tobe moved back and forth thereon by means ol any suitable iorm ot hand or foot-lever.

What I claim iszi l. A transmission device comprising u power-shaft; a driven-shaft independent thereof; u shell scoured to said driven-shaft und inclosng' a portion of said power-Sindh,

u band mounted on the interior of said shell and surrounding said power-shaft; n toggleq'ont having one of its links engaging' said shell and the other link engagingr the free end oi' said baud; and means for operating said to l'5de-joint. whereby said hand -is gradually tightened 'around said powerhafl'.

2. A transmission 'deviee comprising a power-shaft: a drum mounted thereon; a driven-shaft independent. oi" aid power-shaft; a shell secured lo said driven fl, and inelosing said drum: a baud mounted ou the interior ol said shell and surroundingy said drum: a toggle-joint havingI one of its links engaging: said shell and the other link enea ine; the free end o1' said vlland and means 'for operating, s id toggle-joint whereby said hand is gradually (inhiened around said drum,

25. A transmission device comprising a power-shaft: a driven-shall. ixnlepemlent, thereof; a shell secured lo said driven-shaft and inelosing' a portion of 'aid power-shaft: a hand Vmounted on the interior nl' id shell and sur rounding' said power-shaft; a toggle-joint having; one ol' its links engaging' aid shell and the other lilik eneauingx the l`ree end `ol' said hand; a pinion havin;Y one end of its spindle screw-threaded and tapped into a hearing' in said shell. and the opposite end engagljiin.r said loggie; and moans l'or revolving said pinion whereby said toggle is operated l'o gradually tighten said hand around said power-shaft v l -l. transmission device comprisingr a power-shall; a drum mounted thereon: a driven-shaft independentv of said power halt; a shell secured to said driven-simil and in losingf said drum hand mounted on the inlerior oi' said shell and surrounding said drum; a toggle-joint having;I one ol' ils links ene'a inf.: said shell and the other link euLfagiup; the free, end otl ald hand; a pinion having one end oi ils spindle serew-threaded and lapped into a heal-ini,r in said 4one nl.' its links eng: l

shell. and the opposite end engaging Said toggle; and

ils4 links engaging" s. id shell and the other linlr engaging" the l'ree end ot' said hand; a pinion havingl one end of its spindle screw-ihre.- lell and tapped into a hearing; in said shell7 and the opposite end engaging' said togglejoint; and a reeiproeal raek-ha adapted tio revolve Said pinion whereby said toggle is operalod to gradually t1 lfen said baud around said po -shat`t.

(i, A transmission device comprising7l a `po\vershai`l;a drum mounted thereon :r driven-slrltt inilelwndeniI of said power-shall; a, shell serured l'o said driven-shaft and inelosinf.: said drum; a hand mounted on the interior ol' said shell z nl sureoumliln;l said drum; a loggie-jointA havinp in;r said shell and the other link en` ;aging' the l'ree end of s id hand: a pinion ha\'in;V one end ol' its spinllll` screw-lhrealled and lapped into a hearinfr in said shell. and the opposite end engauinj..v said legale'. and a reeiproral rael adapted lo revolve saidoinion whereby s: d to lejs operated to ;raduall\l tighten said hand around said drum, l

in testimony whereof lhave hereunto set my hand lhs lst. d a'v oi' September. A. l). llllll'.

EDWARD lllillY WARNER 

